Create cron schedule for bot-db exporter recipe.

R=hinoka,chanli,stgao,liaoyuke,lijeffrey,prasadv

Bug: 787918
Change-Id: I0766fa1c9d575b9960d336152aa62c56a7a2b945
Reviewed-on: https://chromium-review.googlesource.com/1141117Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575878}

infra/config/global/luci-scheduler.cfg

@@ -3675,3 +3675,15 @@ job {
     builder: "linux_chromium_component_updater"
   }
 }
+
+job {
+  id: "export-bot-db-to-findit-gs"
+  acl_sets: "default"
+  # Run this every six hours, stagger it off the previous one.
+  schedule: "0 1,7,13,19 * * * "
+  buildbucket: {
+    server: "cr-buildbucket.appspot.com"
+    bucket: "luci.chromium.ci"
+    builder: "linux_chromium_bot_db_exporter"
+  }
+}